Enzymes such as pepsin and trypsin are secreted in an inactive form known as a
Correct answer: D. zymogen
- A. coenzyme
- B. cofactor
- C. prosthetic group
- D. zymogen
Explanation
A zymogen, or proenzyme, carries an extra length of polypeptide that blocks the active site, and removing it activates the enzyme once it has reached the place where it is needed. This prevents a protease from digesting the very cells that made it, and failure of the mechanism in the pancreas causes the self digestion seen in acute pancreatitis. Coenzymes and cofactors are helper molecules, not inactive precursors.
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About Characteristics of Enzymes
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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